Do Attics Require Ventilation With Spray Foam Insulation

Oh and when you put it in your attic spray foam insulates the attic itself.

Do attics require ventilation with spray foam insulation.

They need the right level of ventilation but they also require insulation in order to help improve the energy efficiency of the property. When we seal the attic with spray foam it s as tight as a butter tub. This spray foam is applied as a low or high pressure two component polyurethane spray foam that can be applied onto walls in unvented attics to ducts and ceilings and in vented attics and crawl spaces. Here s the answer to the question posed in my article title.

Do attics with spray foam insulation need ventilation. Nope you absolutely do not need to ventilate a spray foam house and here s why. It is also known to act as an air barrier however unfortunately it will not protect against vapor and moisture intrusions. Unvented attic assemblies unvented attics rely on an air impermeable insulation installed to the roof deck s underside i e.

It s terrific because it s pretty much the same temperature as the rest of the house all the time. I have a spray foamed attic. Because basically now that attic is a conditioned space. However in a traditionally insulated attic insulation on the ceiling the attic is vented.

Compared to traditional insulation whether fiberglass or cellulose spray foam has the potential to provide better performance via its air sealing properties high r values per inch of thickness and in the case of closed cell spray foam ability to repel moisture.